Fuse plug



BEST AVAlLABLE COP\ N. C. BUTLER FUSE PLUG Feb. 2 1926, 1,571,702

Filed Oct. 8, 1920 Mam WZM Patented Feb. 2 1926..

BEST-AVAILABLE cor. 1 571 702 ,j UNITED STAT S PATENT oFFicE.

' -NATHAN c. BUTLER, or cLnvELANi), oar Io. (I

FUSE PLUG.

Application filed October 8, 1920 Serial No. 415,628.

havingan exterior threaded contact for engagement in a-suitable socket, and a removable member carrying the fuse' which has its .endssecured to a center contact and to a peripheral contact respectively, the last named contact being removably connected to the main contact member.

It is also the purpose of this invention to provide a removable fuse carrying member with an insulator extension between the two contacts for preventing arcing, to. connect-the fuse element to the peripheral contact in a manner to prevent rotation thereof, and to further arrange the removable memher in a manner such as it will hold'the mica or other transparent element in place in the main member. Otherfeatures of the invention are the provision of suitable gas vents, and the provision of suitable recesses or grooves for holding the fuse wire in place. Other features of the invention will more fully and at large appear from the following description, drawin and claims.

Referring to the awings, Fig. 1 is a side elevation of a plug with parts broken away; Fig. 2 is a sectional view of the main portion; Fig. 3 is a bottom plan view of the main member; Fig. 4 is a sectional view of the removable fuse member; Fig. -5 is a bottom plan view; Fig. 6 is a top plan view with the fuse wire removed Fig. 7 is a moditied form partly in section of the removable fuse member; Fig. 8 is a modified form of the main member with the threaded conductor shellbroken away; Fig. 9 is a sectional view of the main member of Fig. 8 with the conductor shell removed.

In the arrangements shown in Figs. 1 to 6.

the main fuse member 1 is provided witha central window or opening 2 communicating f with an enlarged. fuse chamber 3. "The 1 chamber 3 is larger in diameter than open-". ing 2 to provide ashouldcr 4-which is inter;

rnpted to form corrugations 5. Theseicor rugations merge into corrugationsfi formed a on the main wall of the chamber 3., The corrugations 5 and .6 provide means for cen tering and holding a glass or 'mica disc 7 which provides a window in the main fuse member. These corrugations also afford a passage between the chamber 3 and the outside atmosphere for the escape of gases.

The main fuse member is provided with a threaded portion 8 adapted to receive athreaded conductor shell 9 which. is secured 1 in place by depressing a portion 10 of the shell 9 into a longitudlnallydisposed groove or channel 11, arranged in the exterior of the threaded portion 8. This channel 11 com'-- munieates with a radially disposed recess 12 providing communication between the channel 11 and the chamber 3 whereby gases are permitted to escape." The threaded shell 9 extends beyond the main fuse member as 18 shown in Fig. 2 for a purpose which-wil later appear.

The removable fuse member comprises a body portion 13 having a central opening therein for receiving a center contact 14 b0 which is preferably in the form of a bifurcated rivet, the prongs of the rivet beingspread in a central 0 ening 15 formed in the body portion. e opening 15 is an enlargement of the opening which receives the shank of the contact 14. The iannular extension '16 is formed of insulating .material integral with the main body ortion 13/ This member is slightly tapcre on itsexterior and has an annular enlargement 17 at its base where'it joins the main body portion. This enlargement 17 is provided with diametrically opposed longitudinally extending grooves 18 for a purpose to he later described. The main body portion 13 9 is slightly reduced and threaded to receive the threaded portion 19 of the fuse contact .20. This .contacthas an upwardly extending' sleeve 21 which is forced down on the enlargement 17. The extension 16 is prowe vided at its upper end with notches 22 which into the threaded extension ofthe shell 9 of the main fuse member.

" It will be seen from the fore oing. that the removable fuse carrying mem er comprises the insulator body portion and extension, the center contact 14 and the peripheral contact 20, together with a fuse which is electrieally connected to these parts, and that thismember ma be assembled and removably secured 'in t e main fuse member; and when secured the upper end of the extension 16 will hold the glass or mica disk 7 in place against the corrugations 5. Suitable gas vents are. provided by the corrugations and by the channel 11 and recess 12. Itis to be understood that the depression of the portion 10 of the shell 9 does not entirely close the recess 11 and. that the threaded member 10 does not close the upper end of recess 11 when in fully engaged position, as seen in Fig. 2.

In the modification of the removable fuse member shown in Fig. '7, the extension 16 is not only provided with the notches-22 but with longitudinally disposed grooves 24 extending therefrom to the main ody portion 13'. Here the contact 20 engages the fuse member b friction alone.

In the modi cation shown in Figs. 8 and 9 the main fuse member is formed as a trans arent glass body 25 having the inte Fextension 26 forming the inner fuse chamber 27. Otherwise the structure in this modified form is the same as in the main form of device above described, including the groove 11 and recess 12 for permitting escape of gases, as well as the depressed portion 10 for securing the socket engaging member 9 in ,fully engaged position upon the main insulator member 1.

What I claim is:

1. A fuse plug comprising a socket engaging member formed with an interior chamber having openings through the ends of said member, a closure for one end of said member and positioned within the same, and means normally providing a gas vent from said chamber past said closure, a fuse member removably secured in the other end of said chamber and provided with electric connections through said members.

2. A fuse plug comprising a socket engaging member formed with an interior chamber havin openings through the ends of said member, one of said ends having an 2 I 1,571,70 BESTAVAILABLE coex a socket engaging member upon said in'sula tor'or member, a fuse member removably secured in the otherend of said insulator member and provided with electric connections through said socket engaging member,

and means permitting escape of gases from said chamber out between said insulator and socket engaging members 5 4-. A fuse plug comprising a socket engaging member formed with an interiorjchamber having openings through the ends of said member and having a seat at one-open-' ing, aiclosure for said one opening, a fuse member removably secured within the other end of said chamber and holding said closure agalnst said seat, said fuse member having electric connections through said socket engaging member.

5. A fuse plug comprising a socket engagmg member, a fuse member removably secured by positive locking engagement in said fir st named member, said fuse member comprlsing a hollow elongated insulator portion, a fuse having one end secured within said msulator portion and its other end secured outside thereof, and electric connections through said fuse and said socket engaging member.

6. A fuse plug comprising a socket engagmg member, 'a fuse member removablv secured in said first named member, said fuse member comprising a hollow elongated insulator portion, a contact extending through said insulator portion, a conductin element secured entirely on the outside 0 said insulator portion and'adapted for conductive engagement with said socket engaging member, and a fuse having its ends attached to said contact and conducting element, respectively.

7. Afuse plug comprising a socket engaging member formed with an interior chamber having openings through the endsvof said member, a closure for one of said openings, 'a fuse member removably secured within said other opening and holding said clo-- sure in position, said fuse member comprising a hollow insulator portion having a depression in the end thereof which engages said closure, a fuse having its ends attached to the inside and outside of said insulator portion, respectively, and lying in said depression, and electric connections through said fuse and said socket engaging member.

8: A fuse plug comprising a main insulator member, a socket engaging member carried thereby, a fuse member comprising an second congzict member carried by said last BEST AVAlLABLE COPY a named insulator member, a fuse having its ends attached to said contact members, re- 19 speetively, and an insulator ,Wall between said contacts.

In testimony whereof I hereby afiix my signature.

NATHAN 0; BUTLER, 

